When a piece of metal is illuminated by monochromatic light of wavelength λ then the stopping potential for photoelectric current is 
. When the same surface is illuminated by light of wavelength 
, then the stopping potential becomes 
. Find the value of threshold wavelength for photoelectric emission.
A
B
.
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
As, 
;
so 
…….(i)
and 
……..(ii)
From (i); 
From (ii) and (iii),
or 
or 
or 
.
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